I suggested the baud rate trigger should be a two-step process, one unusual baud rate followed by another within a time window, so opening at 1200 baud could be done without triggering an entry into BOOTSEL mode but they went for the instant trigger approach.It can also trigger accidentally, as I've already seen happening.
What annoys me is that MicroPython by default doesn't accept either, not baud rate change nor 'picotool' vendor USB commands, so you have to invoke BOOTSEL mode via a forced program.
In that respect, and because 'ampy' is outdated and has some issues under Bookworm, I have just finished updating my utility which will force BOOTSEL mode as quickly as possible regardless of what's running on the chip. For interest the algorithm is as follows -
Code:
If already in BOOTSEL mode FinishedIf 'lsusb' indicates MicroPython is running If the '/dev/ttyACMn' serial port exists If 'mpremiote' installed Use 'mpremote' to execute a "machine.bootloader()" command If in BOOTSEL mode FinishedUse 'picotool' to force entry to BOOTSEL modeIf in BOOTSEL mode Finished If the '/dev/ttyACMn' serial port exists Open the serial paort with 1200 baud If in BOOTSEL mode Finished If 'mpremote' installed Use 'mpremote' to execute a "machine.bootloader()" command If in BOOTSEL mode FinishedReport BOOTSEL mode must be manually enteredStatistics: Posted by hippy — Mon Dec 02, 2024 8:49 pm